I've seen this "herding" effect on forums with previous cars before. Everyone was going crazy about tune X and tune Y completely changing their cars and what not. I tried a lot of them back then, and most of them were really not impressive or plain sucked.

For the M3 I can imagine the gains with a full exhaust for example, but with an otherwise stock car, or just mufflers, 91 octane, and stock air intake, it's hard to imagine having the car completely transformed with just a tune. Small improvements and tweaks here and there I can understand, but to the level of some reviews I've been reading lately it's hard to believe.

That's a lot of speculation if you haven't tried the tune yourself though. Comparisons to some other tune and some other car are not even relevant. You have to remember that power isn't everything. Not everyone purchases a tune cause they are trying to achieve a certain power number.

We don't coach clients on what to say if/when they decide to review our services. We also have no control on whether a posted review will be negative or positive. It's clear that people are enjoying our products for one reason or another. People can scrutinze whether X number was achieved or whether it's valid only if it's on X dyno all day long but at the end of the day, we have 100% customer satisfaction and are proud of the service we offer. If there was someone truly unhappy about our products or claims of performance, you would have seen it on here by now.